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The mechanism of whisker crystals formation process by aluminum aerogels burning was studied adapting for ceramic technology problems solution. The correlation of aluminum aerogels burning characteristics and the final combustion products structure was found. The burning temperature, air pressure and nitrogen concentration are significantly effect on the crystals growth mechanism. A wide variety of the crystal morphology in condensed combustion products was found depended on experimental condition. [ABSTRACT FROM PUBLISHER]

The macro and micro morphology, and the crystal structure of Si nanowires prepared by singlestep catalytic metal assisted etching were investigated. Here, we prepared the Si nanowires by metal assisted etching with electroless-deposited Ag catalyst on Si (100) substrate. We used mixture of silver nitrite and hydrofluoric acid as a plating bath of Ag, as well as etching solution of Si. The morphology and crystalline structure of the nanowires as a function of concentration of silver nitrite in etching bath were investigated by SEM and cross-sectional TEM observations. With increasing concentration of the silver nitrite in the etching solution, the surface of nanowires tends to be porous structure with very fine pores of a few nm (porous Si nanowire). When concentration of silver nitrite is low, single crystal Si nanowires with a smooth surface without pores were observed. The porous Si nanowires consisted of the nano scaled crystals and partially amorphous Si nears its surface. [ABSTRACT FROM PUBLISHER]

We report on the electrical properties of Field-Effect Transistors (FETs) based on C60 nano-whiskers (C60 NWs). The C60 NWs-FETs exhibits n-channel, normally-on, properties and the carrier mobility is estimated to be almost 2 × 10-2 cm2/Vs under vacuum conditions at room temperature. We also report on C60 NWs-FET characteristics with low work-function source and drain (Mg) electrodes. The carrier mobility of Mg-electrode device is slightly higher than that of the Au-electrode one. © 2007 American Institute of Physics [ABSTRACT FROM AUTHOR]

Electrical transport measurements for Bi2Sr2CaCu2Oy whiskers with a single-step superconducting transition were carried out at high temperature ranging from 70 to 77 K below the superconducting transition temperature (= 81.5–82.5 K) to investigate critical current density (Jc) under magnetic fields along the crystal c axis. The Jc parallel to the crystal a axis, which was estimated from the V-I curves, enhances under several ten oersteds, and then decreases with increasing the magnetic field. This peak effect in the low-field regime at high temperature has temperature dependence in contrast to the case of matching effects. © 2006 American Institute of Physics [ABSTRACT FROM AUTHOR]